Spring Webflux - Framework name and version not populated

[Mistborn94]

Is your feature request related to a problem?

When using Spring MVC, the service.framework.name and sevice.framework.version fields are populated on transactions. They are not populated for Spring Webflux.

Describe the solution you'd like

Framework name and version should be populated. It looks like this can be implemented in the co.elastic.apm.agent.springwebflux.TransactionAwareSubscriber in the apm-spring-webflux-spring5 module

Describe alternatives you've considered

I tried populating it myself using the apm-agent-api but that only supports setting the framework name, not the framework version.

apm-agent-java/apm-agent-api/src/main/java/co/elastic/apm/api/Transaction.java

Line 68 in 9136751

Transaction setFrameworkName(String frameworkName);